Re: th400 to 700r4 swap question
You will need to add a lock up for the 700, B&M and TCI makes a good kit that will let you lock it up after you doing 55 or 60. That is about the only time you need it to lock up is when you are going over 55 for any long times.
And you need to look at the the splines counts are on both 700 and 400 you will need them to be the same.. Good luck..
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